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Forum: OpenFOAM Running, Solving & CFD

July 23, 2013, 05:23

Replies: 6

Adams-Bashforth implicit scheme for time.

Views: 3,023

Posted By ARTem

Okay, e.g., let's take icoFoam and use AB for...

Okay, e.g., let's take icoFoam and use AB for momentum time discretisation.

icoFoam.C looks like:

...
fvVectorMatrix UEqn
(
fvm::ddt(U)
+ fvm::div(phi,...

Forum: OpenFOAM Running, Solving & CFD

July 23, 2013, 04:42

Replies: 6

Adams-Bashforth implicit scheme for time.

Views: 3,023

Posted By ARTem

Of course, you can study how CrankNicholson...

Of course, you can study how CrankNicholson scheme is implemented in OF and create AB from it, but this is the fastest way.
By the way, Crank-Nicholson scheme is easy to implement too

yEqn
(
...

Forum: OpenFOAM Running, Solving & CFD

July 22, 2013, 04:35

Replies: 6

Adams-Bashforth implicit scheme for time.

Views: 3,023

Posted By ARTem

Hello, Mirage12. For example, I want to...

Hello, Mirage12.

For example, I want to solve ∂y/∂t + ∂(yU_i)/∂x_i = 0. To use Adams-Bashforth, I should do next

y^(n+1) = y^(n) - dt*(3/2*( ∂(y^(n+1)U_i)/∂x_i) - 0.5*( ∂(y^(n)U_i)/∂x_i)). That...

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